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RAR-251 - Stub Axle Suspension
Trailer Air-Ride Suspension
Installation and Service Manual
Suspension Identification ..................................... 2
Suspension System/Axle Serial Tag
Installation ............................................................. 3
Prior to Installation
Axle Integration
Axle Weld Standards
Suspension Mounting
Torque Specifications
Maintenance .......................................................... 8
Recommended Service Intervals
Parts Illustration
RAR-251 - ADB Assembly
Pivot Bushing Replacement Procedure
Lower Beam Assembly - Bearing Replacement Procedure
Warranty ............................................................... 12
Part No.: 9710119
Doc:
251-Trailer-ISM 09-13-18
251-Trailer-ISM 09-13-18
Page 1
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Summary of Contents for Ridewell Suspensions RAR-251
- Page 1 RAR-251 - Stub Axle Suspension Trailer Air-Ride Suspension Installation and Service Manual Suspension Identification ........2 Suspension System/Axle Serial Tag Installation ............. 3 Prior to Installation Axle Integration Axle Weld Standards Suspension Mounting Torque Specifications Maintenance ............8 Recommended Service Intervals...
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Page 2: Suspension Identification
SUSPENSION IDENTIFICATION Introduction The Ridewell Air Ride (RAR) 251 Trailer Suspension is designed for use in a range of applications. The suspension can be purchased with or without an inte- PART NO: grated stub-axle. SERIAL NO: The mounting hardware kit enclosed with the sus- pension is designed for a basic vehicle installation ross eiGht... -
Page 3: Prior To Installation
Consult the vehicle manufacturer or Federal is not permitted without the express written Motor Vehicle Safety Standards (FMVSS) 121 for permission of Ridewell Suspensions. more information. • The installer must verify there is sufficient clear- ance for proper functioning of the suspension, air springs, brake chambers, axle and tires. - Page 4 Axle Integration Suspension systems are available with and without a factory integrated axle. Customer-supplied axle assemblies must be positioned and oriented (rotated) properly before welding the axle to the axle seats. Use the top-center mark on the axle, if available, to identify the center of the axle and orient the axle as- sembly on the suspension.
- Page 5 ROOT 1/2" SECOND PASS 3/8" PASS THIRD 1/8" MAX PASS AXLE AXLE AXLE AXLE 1/2" BEAM AXLE SEAT BEAM AXLE SEAT BEAM AXLE SEAT BEAM AXLE SEAT THIRD PASS WELD JOINT PREPARATION FIRST PASS SECOND PASS ARC START ARC START ARC STOP ARC STOP THIRD PASS...
- Page 6 Frame hangers are an optional component of the • Refer to engineering drawing to install shock RAR-251 Trailer Suspension. Ridewell can design a absorber. Torque to specifications (Page 7). suspension hanger for a specific application. • Complete assembly and installation of air springs It is the responsibility of the trailer OEM to design as shown on the engineering drawing.
- Page 7 RAR-251 Trailer Suspension - Torque Specifications Torque Values Fastener Type Size foot-pound Newton-meter Center Bolt (HHCS) - Lower Beam Assembly 1 1/4”-7NC 750 ft-lb 1017 N-m Pivot Bolt/Pivot Nut (Pivot Assembly) 1”-14NF 500 ft-lb 678 N-m Nut (Air Spring) 3/4”-16NF...
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Page 8: Maintenance
MAINTENANCE A visual inspection of the suspension structure should be performed during each pre-trip/safety inspection. Ridewell Suspensions recommends the following minimum service intervals for standard duty, on-highway usage applications. More frequent intervals are recommended for heavier duty applications. Every 50,000 miles of use Refer to the following Technology &... - Page 9 Lower Bracket Mount (Shock Absorber) Limiter Chain Attachment (Drum Brake) Bolt Lock Washer (Air Spring) Figure 5. RAR-251 Trailer Suspension for stub axle (Air Disc Brake Assembly shown). Refer to the engineering drawing for the component part number. 251-Trailer-ISM 09-13-18 Page 9...
- Page 10 RAR-251 Trailer Suspension – Pivot Bushing Replacement Components Replacement Torque Values Part Numbers Hardware Description foot-pound Newton-meter 11400016 Pivot Bolt (HHCS) 1”-14NF (Grade 8) 500 ft-lb 675 N-m 1150031 Pivot Nut 1110088 Spherical Bushing 7002768 Alignment Washer 1161480B100 Flat Washer Lower Beam Assembly (LBA) –...
- Page 11 Pivot Bushing and Lower Beam Assembly (LBA) Bearing Replacement Chock wheels. Raise vehicle to height that removes load from suspension and support with jack stands. Dis- connect the linkage from the height control valve(s), if necessary, and exhaust all air from the air springs. Failure to properly chock wheels, exhaust the air system and raise and safely support the vehicle could allow vehicle/suspension movement that could result in serious injury.
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Page 12: Warranty
Terms and coverage in this warranty apply only to the United States and Canada. Ridewell Suspensions warrants the suspension systems manufactured by it to be free of defects in mate- rial and workmanship. Warranty coverage applies only to suspensions that have been properly installed, maintained and operated within the rated capacity and recommended application of the suspension.
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